2002 Trailblazer Engine computer 12576463 "Programmed to your VIN" ECM PCM ECU
You will need access to a scan tool capable of doing this procedure to do this and clear any related trouble codes (Code P1336). This E.C.M. fits the following: 2002 4.2L Chevrolet Trailblazer/Trailblazer EXT.